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以液态合金的多相结构模型为基础,对电脉冲作用下高硅铝合金熔体结构变化进行了热力学分析,并研究了电脉冲作用下Al-22%Si合金凝固组织的显微硬度以及凝固相变点的变化.实验结果表明,电脉冲促进了呈“胶体”状态存在的Si粒子在Al-22%Si合金熔体中的分解,提高了熔体的均匀程度,部分消除了来自Si原料的遗传性;电脉冲孕育处理提高了Al-22%Si合金熔体的过冷能力,增加了Si粒子在基体组织中的过饱和度,提高了基体的显微硬度;Al-22%Si合金基体显微硬度值的变化显示熔体对于电脉冲频率的响应比较敏感.
Based on the multi-phase structure model of liquid alloy, the thermodynamic analysis of the melt structure of high-silicon-aluminum alloy under the action of electric pulse was carried out. The microhardness and solidification of Al-22% Si alloy solidified by electric pulse Phase transition point.The experimental results show that the electrical pulse promotes the decomposition of Si particles in the state of “colloid” in Al-22% Si alloy melt and improves the uniformity of the melt, Si raw material inherited; electric pulse inoculation increased Al-22% Si alloy melt overcooling ability, increasing the Si particles in the matrix of supersaturation, improve the matrix hardness; Al-22% The change of microhardness of Si alloy matrix shows that the melt is sensitive to the frequency of electric pulse.